As the world economy recovered and grew, the price of oil rose markedly, peaking at almost $70 per barrel in 2005 before ending the year at $61 per barrel. Today, the price continues to hover at around $65. This sustained rise in prices has generated hundreds of billions of dollars of extra revenue for oil exporting countries (e.g. the Bank of International Settlements estimates $1.3 trillion to OPEC since end-1998). This Occasional Paper examines the major sources and uses of this windfall and its impact on global imbalances. The paper is not intended to be a comprehensive assessment of the petrodollar phenomenon, but rather to identify issues that warrant further examination. Key findings of our analysis suggest that: From 2002 to 2005, oil exporters appear to be spending proceeds from the oil windfall relatively evenly on increased imports and reserve accumulation, but import spending and the percentage spent on imports will likely rise over time. Some oil exporters are responding to the windfall by increasing reserves, retiring debt, and setting aside money for future generations, measures which should help insulate them from oil price volatility. Many countries are also channeling financing to productive investments intended to support growth, in contrast to the last oil boom. However in some cases, domestic spending increases have included hefty public sector wage hikes. The complexity and integration of financial markets make it difficult to assess fully where the oil windfall is being invested, though it is clear that domestic equity markets, and, to a lesser extent, real estate markets in the Gulf, are benefiting. Oil producers’ current account surpluses have increased already large global imbalances. While inflation remains broadly contained in oil-exporting countries with pegged exchange rates, more flexible exchange rates would allow better control over domestic monetary conditions and promote efficient external adjustment.